Photographic recording apparatus for galvanometers, oscillographs, and the like.



E. MfiLLNER. PHOTOGRAPHIO RECORDING APPARATUS FOR GALVANOMETERS, OSOILLOGRAPHS, AND THE LIKE,

APPLICATION FILED APR. 4, 1910.

I Patented Feb. 25, 1913.

Fla.

am aa 1/0 rent to be recorded; it is adapted to indi-' cate owing to its deflection'in the magnetic.

' cillographs, and the Like,

UNITED s'ra 'EnMUNn'MfiLLNnn. or BERLIN, GERMANY, ASSIGNOR ro Enron KIWI-1,91 niiaLiN,

GERMANY.

PI'IOTOGRAPHIC RECORDING APPARATUS FOR GALVANOMETE, OS'CILLOGRAEHS,

' AND THE LIKE. p

Specification of Letters Patent.

Patented Feb. 25, 1913.

Application filed April 4. 1910. Serial No. 553,437.

1 0 all whom it may concern Be it known that I, EDMUND Mtimmnn, subject of the Emperor of Austria-Hungary, residing at 39-40 Kottbuser Ufer, Berlin, Germany, have invented new and useful Improvements in Photographic Recording Apparatus for Galvanometers, Os-

of which the fol-. lowing is a specification.

This invention relates to' photographic apparatus for galvanometers, oscillographs and the like and has ';for its object to 1mprove such apparatus by supplementary devices and means, which are hereinafter described and particularly defined in the claims. 7

Referring to the accompanying drawingz-Figure 1 is a side elevation, and Fig.

2 a. plan view of the whole apparatus, Fig.

based on the known principle of the controlling influence of a li ht wire or conducti fiber suspended in the magnetic field 0 an electroma et. It is known that owing to the sensitiveness of the instruments of this type, they mav not only be used for scientific purposes for indicating the most feeble currents) but also for purposes of wireless telegraphy (as auxiliary recording instruments).

In Figs. 1 and 2, the poles of the galvanometric electromagnet b are designated and q; the wire or fiber is supended between the poles at aor in the axis between an upper set screw a and a lower set screw a, the said wire or fiber receiving the curfield. In the event of the apparatus being employed as a receiving instrument for wireless telegraphy, the galvanometer fiber is in circuit with a thermo-elect'ric couple, which serves as the receiving relay of the system. The transmitted feeble current impulses forming the signs are rendered perceptible by the assage or flow of current causing a deflection of the fiber for the respective period. In order that the optical rojecting apparatus may render this adustment of the fiber accessible for direct observation as well as for hotographic recording, it consists of t e arrangement shown diagrammatically in Fig. 5. A small glow lamp 9 is provided immediately be- ,hind the fiber a in a holder or socket f (Fig. 1) belongin to a folding art is of the one pole p. Tie projection ot li ht toether with the formation of a sha ow of t e fiber is effected through an oppositely located object-lens 0 at the end of the optical tube t, which has at the other end a cylindrical lens 0 in order to enlarge the" image on the exposed part of the strip 8 of sensitive paper; by means of the hereinafter described apparatus, the said strip of sensitive paper is moved past the narrow gap of the screen m, where the photographing takes place. As the optical tube t forms a kind of microscope, a plane mirror m formed of two' parts is inserted in the path of rays, as shown in Fig. 5. The two parts of the-mirror ache in a plane, which is preferably inclined at an angle 0f 45 toward the axis of the path ofrays. Consequently, the upper and lower part of the image of the fiber is reflected at an angle of 90. This reflected image will be observed on the screen n. This arrangement, besides permitting simultaneous observation and recording, has also the advantage that for the purpose of photography, the direct path of rays is employed, which possesses a greater luminous intensity than the reflected rays, and which re roduces that part of the fiber which is de ected the most, ready stated the small glow lamp 9 is mounted in a holder or. socket f, which is carried on the one pole piece ;0 bymeans of a hinge-like movable part 70, whereby it is.

As al- Adjusting means for bringing the fiber in a proper ,position for the adjustment of the objective and for adjusting the field of observation on the optical. tube are provided in combination with the apparatus in the known manner. j

The photographic recording apparatus is inclosed in a box' or case d, which is lighttight but permits the renewal of the paper tape spool 7' which is coiled out of sensitive paper.- The 'paper tape 8 runs ofl the spool 1' and over rollers 1, 2, 3, 4, 5, 6 and 7, whence it passes outwardly to the part .2 (Figs. 1 and 2). The rollers 6- and 7 are coacting presser rollers, the roller 7 being fixed on the shaft of the worm wheel j and positively rotated, while the roller 6 revolves reversely to roller 7 and is rotated from the latter.

v age chamber.

to strip the tape from the reel 1' and draw it through the machine. The path of the paper tape 8 is shown in Fig. 3, it being assumed that the back wall of the lighttight case is removed. The sensitized paper tape passes the field of exposure at :22, over the roller 2, the point 00 being the end of the tube t where the tape receives the image of the fiber a. The two rollers 3 and 5 pass the exposed paper downward successively through the developer and through the fix- .ing liquid. For this purpose, two vessels It and '1) are provided within the case containing the recording mechanism. These vessels are of the self supply type and as shown in Fig. 6 each consist of a closed portion 7 communicating wit-h an open spout branch 8' through an opening 9. The opening 9 is of less area than the opening 10 and thus a constant level of liquid is maintained in the spout 8 the portion 7 acting as a stor- An economical supply of fresh liquid to that quantity utilized in the short branch is attained and the large quantity of liquid stored in the long branch remains practically uninfluenced by the liquid in the other branch. Both vessels u and care" adapted to ascend and descend simultanee ously. In the descending position,accord ing to Fig. 3the guide rollers 3 and 5 are situated abovethe liquid level 3 y in the short branch of a and a. Any suitable mechanism may be employed for raising the Vessels; according to the drawing, it comprises a shaft 72 provided withhand-crank h and eccentric cam disks w w. As the vessels u o are raised into the position according to Fig. 4 by turning the hand-crank h, the lengths of the paper tape 8 passing around the rollers 3 and 5 immerse on both sides in the liquid of the vessels. .First of all, the development takes place at u and then the fixing of the photographic image at '0. The paper tape shows, when it passes out of the case cl at a, the photographic reproduction.

The rollers 6 and 7 serve.

of the shadow of the deflected fiber in the form of a bent or crooked line on a dark ground. By refixing and watering, the paper tape may be rendered more suitable for preserving the legibliiess of the signs. The driving of the recording mechanism for the feed of thepaper tape may be effected by a suitable motor or by clockwork. In the example shown, an electromotor e is assumed as thesource of power, which acts by means of worm z' and worm wheel 7'. The disk 8 fixed on the shaft ofthe motor e, forms in combination with the electromagnets 9 an alternating current brake by Jneans of which the load on the motor is kept constant, so that the influence of any sudden fluctuations of revolution of the motor are practically obviated.

Suitable drying means may be provided at the end of the paper tape.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim and wish to secure by Letters Patent is 1. In an apparatus of the character set forth, the combination with the means for detecting wave deflections and a source of illuminant in proximity thereto, of an optical tube adapted to enlarge the image produced by the detecting means, means for feeding a recording tape across the path of said tube, means for projecting the image onto the recording tape and means for de-.

veloping and fixing the image on the tape.

'2. In an apparatus of the character set forth, the combination with the means for detecting wave deflections and a source of illuminant in proximity thereto, of an optical tube adapted to enlarge the image produced by the detecting means, a bi-pa-rt mirror in said tube, and a screen upon which the image isreflected and from which direct readings may be had.

3. In an apparatus of the character set forth, the combination with the means for detecting wave deflections and a source -of illuminant in proximity thereto, cal tube adapted to enlarge the duced by the detecting means,

of an optia bi-part mirror arranged at an angle in said tube where-' image proby the image is projected through the gap between the parts of'the mirror, means for feeding a recording tape across the path of said tube, and means for developing and fixing the image on said tape.

In an apparatus of the character set forth, the combination with the means for detecting wave deflections and a source of illuminant in proximity thereto, of an optical tube adapted to enlarge the image produced by the detecting means, means for feeding asensitizedtape across the path of the optical tube, and a plurality of automatically reciprocable vessels containing developing and fixing fluids wherein the image on the tape is developed and fixed. 5. In an apparatus of the character set sforth, the combination with the means for detecting wave deflections and a source of illuminant in proximity thereto, of means for enlarging the image produced by said detecting means, means for feeding a sensi- 10 tized tape adapted to receive saidimage, vessels containing fluids for developing and fixing the image on said tape, and means whereby said vessels are moved to immerse the tape during the feeding thereof.

In testimony whereof I have signed my 15 name to this'specification in the presence of two subscribing witnesses EDMUND MULLNER.

Witnesses:.

WOLDEMAR HAUPT, -HENRY HASPER. 

